Wheels - Aftermarket Wheel Rims With Pressure Switches

89porsche06

Technical Bulletin


Subject: Aftermarket Wheel Rims with

Tire Pressure Monitoring Switches

Model Group

928 S4, 4
928 GT

Part Identifier Number

4410 8913

December 8, 1989

ATTENTION: Service Manager/Service Technician

Porsche does not approve the use of other than original equipment wheel rims on cars equipped with tire pressure monitoring systems (RDK), even if the rims are equipped with pressure switches.

All of the components of the tire pressure monitoring system and the combination wheel/pressure switch on Porsche vehicles are of matched design to ensure optimum system performance.

Important conditions for proper function of the tire pressure monitoring system are:

- Sealing of pressure switch on wheel rim.

- Design of the rim contour to prevent excessive pressure on the switch diaphragm from tire beads when mounting tires.

- Design of wheel/tire assembly to prevent excessive temperatures in the area of the pressure switch.

- Precise positioning of the pressure switch on the wheel rim within specific tolerances and correct position of the switch in relation to the high frequency sender.

Important Note: Use of aftermarket wheel rims with tire pressure monitoring switch may void existing warranties.